| 摘要 |
<p>1,163,656. Moulding compositions based on trans-1,4-polyisoprene. POLYMER CORP. Ltd. 13 Feb., 1967 [16 Feb., 1966], No. 6789/67. Heading C3P. A composition comprises a major proportion by weight of trans-1,4-polyisoprene together with a minor proportion by weight of a compatible polymer together with 30-150 parts by weight per 100 parts by weight total polymer of a filler having an average particle size less than 45 Á. Suitable compatible polymers are butyl rubber, oil-extended SBR and a mixture of SBR and styrene-butadiene resin. Suitable fillers are kaolin, calcium carbonate, carbon black and silica. The composition may be moulded to form a cutting block.</p> |
